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参数资料
| 型号： | ICS9250YF-23 |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 166.67 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO56 |
| 封装： | 0.300 INCH, MO-118, SSOP-56 |
| 文件页数： | 11/15页 |
| 文件大小： | 184K |
| 代理商： | ICS9250YF-23 |
5
ICS9250-23
0391B—09/18/03
Fig. 1
Via to
VDD
Clock trace to load
Series Term. Res.
Programming
Header
Via to Gnd
Device
Pad
2K
W
8.2K
W
Shared Pin Operation -
Input/Output Pins
The I/O pins designated by (input/output) serve as dual
signal functions to the device. During initial power-up,
they act as input pins. The logic level (voltage) that is
present on these pins at this time is read and stored into
a 5-bit internal data latch. At the end of Power-On reset,
(see AC characteristics for timing values), the device
changes the mode of operations for these pins to an
output function. In this mode the pins produce the
specified buffered clocks to external loads.
To program (load) the internal configuration register for
these pins, a resistor is connected to either the VDD
(logic 1) power supply or the GND (logic 0) voltage
potential. A 10 Kilohm (10K) resistor is used both to
provide the solid CMOS programming voltage needed
during the power-up programming period and to provide
an insignificant load on the output clock during the
subsequent operating period.
Figure 1 shows a means of implementing this function
when a switch or 2 pin header is used. When no jumper
is installed the pin will be pulled high. With the jumper in
place the pin will be pulled low. If programmability is not
necessary, then only a single resistor is necessary. The
programming resistors should be located close to the
series termination resistor to minimize the current loop
area. It is more important to locate the series termination
resistor close to the driver than the programming resistor.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ICS9250YF-25-T | 制造商:ICS 制造商全称:ICS 功能描述:Frequency Generator & Integrated Buffers for Celeron & PII/III⑩ |
| ICS9250YF-26-T | 制造商:ICS 制造商全称:ICS 功能描述:Frequency Generator & Integrated Buffers for Celeron & PII/III⑩ |
| ICS9250YF-27-T | 制造商:ICS 制造商全称:ICS 功能描述:Frequency Generator & Integrated Buffers for Celeron & PII/III⑩ |
| ICS9250YF-28-T | 制造商:ICS 制造商全称:ICS 功能描述:Frequency Generator & Integrated Buffers for Celeron & PII/III⑩ |
| ICS9250YF-29-T | 制造商:ICS 制造商全称:ICS 功能描述:Frequency Generator & Integrated Buffers for Celeron & PII/III⑩ |
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